Kurt Ruppert: Rescuers search for missing skydiver

SYDNEY, AUSTRALIA - DECEMBER 17: Skydivers in Santa Claus costumes dive in formation over Sydney to launch the new festive experiences range by an Australian online experience company, at Picton on December 17, 2008 in Sydney, Australia. The gift experience company's festive offerings include tandem skydives with Santa, Bondi Bash with Santa boating experience, a trip to the North Pole to find Santa and snowmobiling in Lapland. (Photo by Brendon Thorne/Getty Images)

NORTH BEND, WA - Rescue crews spent their fourth straight day looking for a skydiver who vanished during a jump above Washington's Cascade foothills, but found no sign of the Florida man by dusk.

King County sheriff's Sgt. Cindi West says 100 searchers were out near 4,200-foot Mount Si east of Seattle early Sunday to find 29-year-old Kurt Ruppert of Lake City, Fla.

Ruppert hasn't been seen since he jumped out of a helicopter at 6,500 feet Thursday afternoon, wearing a special wing suit with fabric under the arms to allow him to glide like a flying squirrel.

Crews narrowed their search area Saturday, based on data from Ruppert's cell phone and the helicopter's flight path. It wasn't immediately clear whether the search would continue Monday.

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